STMicroelectronics EVLMG1-250WLLC

Overview

EVLMG1-250WLLC from STMicroelectronics is a fully assembled, ready-to-use demonstration board implementing a high-frequency resonant LLC DC/DC converter based on the MasterGaN1 integrated GaN half-bridge power stage. It delivers 24 V at up to 10.4 A (250 W), operates from a nominal 400 V ±10% DC input, achieves >92% peak efficiency, and integrates short-circuit, overcurrent, and brownout protection.

For engineers reviewing the EVLMG1-250WLLC datasheet, EVLMG1-250WLLC pinout, EVLMG1-250WLLC application, or EVLMG1-250WLLC equivalent, this board serves as a validated reference for industrial DC-DC conversion where compact size (100 × 60 mm), high power density (20 W/in³), and GaN-enabled high-frequency operation are critical design requirements.

Technical Context

The EVLMG1-250WLLC implements a two-stage architecture: a primary-side motherboard hosting the L6599A resonant controller and ETD39 transformer, and two daughterboards - one integrating the MasterGaN1 (dual GaN HEMT + gate driver in PQFN 5×6 mm) and another hosting the SRK2001 synchronous rectification controller with STL120N8F7 MOSFETs. Input voltage monitoring enables precise sequencing in cascaded PFC-LLC systems.

Operating frequency exceeds conventional silicon-based LLC designs due to MasterGaN1's low Qg and fast switching, enabling elimination of primary-side heatsinks. Protection features include cycle-by-cycle current limiting via MasterGaN1's SENSE pins, output overvoltage clamping, and auxiliary rail (VAUX) regulation for stable controller biasing.

Key Specifications

Availability

EVLMG1-250WLLC is available at Aetrix Electronics and suitable for industrial DC-DC converters, high-density AC/DC adapters, and consumer-grade SMPS requiring stable component supply, rapid prototyping validation, and GaN-based reference design reuse.

Supply support for EVLMG1-250WLLC includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, analog, microcontrollers, and automotive ICs with broad industrial and consumer reach.

This board belongs to ST's MasterGaN evaluation platform series, designed to accelerate adoption of gallium nitride technology in high-efficiency, high-power-density offline power supplies and industrial DC-DC conversion.

FAQ

What is the primary controller used on the EVLMG1-250WLLC motherboard?

The motherboard uses the L6599A resonant LLC controller from STMicroelectronics, configured for high-side and low-side gate drive with built-in oscillator, dead-time control, and current-sense protection inputs tied to MasterGaN1's SENSE pins.

Does the EVLMG1-250WLLC require external heatsinking on the primary side?

No - the board operates without primary-side heatsinks due to the low conduction and switching losses of the MasterGaN1 GaN power stage, verified under full 250 W load at 40°C ambient per DB4385 test conditions.

Can the output voltage be adjusted, and if so, how?

Yes - output voltage is set by the TL432AIL3T shunt regulator feedback network on the secondary side; changing resistor dividers R15/R16 (on motherboard) adjusts the regulated 24 V output within ±5% range per schematic Figure 2.

Is the EVLMG1-250WLLC RoHS and WEEE compliant?

Yes - the board complies with RoHS Directive 2011/65/EU and WEEE Directive 2012/19/EU, confirmed in the official data brief DB4385 Rev 1, and uses lead-free solder and halogen-free laminates throughout.